JPH024287Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a check valve that is connected to various fluid supply pipes and the like.

[Conventional technology and its problems]

Conventionally, as a type of check valve of this kind, as shown in FIG. A valve seat 6 having a plurality of valve holes 7 is arranged to form a negative pressure chamber 8 on the fluid outlet 4 side of the valve seat 6, and a predetermined pressure is provided within the negative pressure chamber 8 by the elasticity of a coil spring 9. It is known that a valve 10 having an annular lip 11 that is pressed against the valve seat 6 with a pressing force of 10 is arranged in a "normally closed" configuration. Reference numeral 12 is a spring receiver, 1
3 and 14 are filters, and 15 is an O-ring. The check valve having such a configuration has the fluid outlet 4
is connected to a negative pressure signal source (not shown) and is used with the fluid inlet 2 open to the atmosphere.
When a negative pressure signal is sent from the negative pressure signal source to the negative pressure chamber 8 and the pressure inside the chamber 8 is reduced, the sum of the pressure inside the chamber 8 and the elastic force of the extension of the coil spring 9 overcomes the atmospheric pressure. The valve 10, which had been closed due to the pressure, opens due to pressure from the atmospheric pressure, and the atmosphere flows into the negative pressure chamber 8 through the valve hole 7, and the pressure inside the negative pressure chamber 8 increases due to the inflow of the atmosphere. When the check valve increases, the valve 10 closes again, and the check valve repeats this opening and closing operation in a fast cycle. However, it has the disadvantage of producing a so-called squealing sound.

[Means for solving problems and their effects]

In view of the above-mentioned problems, the present invention aims to provide a check valve configured to prevent the generation of squealing noise. Focusing on the problems caused by one-sided opening, at least one pair of uneven guide parts is provided to maintain the concentric state of the valve seat and the valve during opening and closing operations, and the two parts are kept concentric. By preventing the door from opening, no squealing noise is generated.

The concavo-convex guide portion is provided at a location separate from the valve hole by a combination of a funnel-shaped hole and a tapered projection with a pointed tip that engages with the hole, and the guide portion is provided at a location separate from the valve hole. The valve hole does not require any modification at all.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.The opposing surfaces of the valve seat 6 and valve 10 shown in FIG. 1 have a funnel-shaped guide hole 16 in the center thereof. A pair of guide portions each consisting of a tapered guide protrusion 17 with a sharpened tip that engages is provided, and at least immediately before and immediately after the lip 11 of the valve 10 comes into contact with and leaves the valve seat 6 during the opening/closing operation of the valve 10. teeth,
The valve seat 6 is always guided by the guide section.
The valve 10 and the valve 10 are maintained in a concentric state, and both members are configured so as not to be in a so-called single-open state.

[Effect of idea]

As explained above, the check valve of the present invention has the following features:
At least a pair of concave and convex guide portions are provided on the opposing surfaces of the valve seat and the valve that moves toward and away from the valve seat to keep the two members in a concentric state during opening and closing operations of the valve, which is relatively simple. This structure prevents the valve from opening on one side and prevents the occurrence of squealing noise. In addition, the uneven guide part is provided at a location other than the valve hole by a combination of a funnel-shaped hole and a tapered projection with a sharp tip that engages with the hole, so that, for example, the projection can be engaged with the valve hole. Compared to the case where the flow rate is set in the design, it is not difficult or complicated to set the flow rate, and when the protrusion fits loosely into the valve hole, the two do not become eccentric and cause turbulence in the fluid flow. . The combination of a funnel-shaped hole and a tapered protrusion with a pointed tip has the effect of not generating large sliding resistance when engaged.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a check valve according to an embodiment of the present invention, and FIG. 2 is a sectional view showing an example of a conventional check valve. 1...Lower case, 2...Fluid inlet, 3...Atsupa case, 4...Fluid outlet, 6...Valve seat, 8...Negative pressure chamber, 9...Coil spring, 1
0... Valve, 16... Guide hole, 17... Guide protrusion.

Claims (1)

[Scope of utility model registration request] A valve seat 6 having a valve hole 7 is disposed inside the cases 1 and 3 so as to block the flow path from the fluid inlet 2 to the fluid outlet 4, and a negative valve is provided on the fluid outlet 4 side of the valve seat 6. In a check valve configured to be normally closed, a pressure chamber 8 is formed, and a valve 10 which is pressed against the valve seat 6 with a predetermined pressing force by the elasticity of a coil spring 9 is arranged in the negative pressure chamber 8. , the valve seat 6 and the valve 10
At least a pair of concave-convex guide portions are provided on opposing surfaces of the valve 10 to maintain the concentric state of both members 6 and 10 during the opening/closing operation of the valve 10, and the guide portion is connected to the funnel-shaped hole 16 and the hole 16. A check valve characterized in that it is formed by a tapered protrusion 17 having a pointed tip.